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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef MOZILLA_GFX_BASEMARGIN_H_
#define MOZILLA_GFX_BASEMARGIN_H_
#include <ostream>
#include "Types.h"
namespace mozilla {
/**
* Sides represents a set of physical sides.
*/
struct Sides final {
Sides() : mBits(SideBits::eNone) {}
explicit Sides(SideBits aSideBits) {
MOZ_ASSERT((aSideBits & ~SideBits::eAll) == SideBits::eNone,
"illegal side bits");
mBits = aSideBits;
}
bool IsEmpty() const { return mBits == SideBits::eNone; }
bool Top() const { return (mBits & SideBits::eTop) == SideBits::eTop; }
bool Right() const { return (mBits & SideBits::eRight) == SideBits::eRight; }
bool Bottom() const {
return (mBits & SideBits::eBottom) == SideBits::eBottom;
}
bool Left() const { return (mBits & SideBits::eLeft) == SideBits::eLeft; }
bool Contains(SideBits aSideBits) const {
MOZ_ASSERT(!(aSideBits & ~SideBits::eAll), "illegal side bits");
return (mBits & aSideBits) == aSideBits;
}
Sides operator|(Sides aOther) const {
return Sides(SideBits(mBits | aOther.mBits));
}
Sides operator|(SideBits aSideBits) const { return *this | Sides(aSideBits); }
Sides& operator|=(Sides aOther) {
mBits |= aOther.mBits;
return *this;
}
Sides& operator|=(SideBits aSideBits) { return *this |= Sides(aSideBits); }
bool operator==(Sides aOther) const { return mBits == aOther.mBits; }
bool operator!=(Sides aOther) const { return !(*this == aOther); }
private:
SideBits mBits;
};
namespace gfx {
/**
* Do not use this class directly. Subclass it, pass that subclass as the
* Sub parameter, and only use that subclass.
*/
template <class T, class Sub>
struct BaseMargin {
typedef mozilla::Side SideT; // because we have a method named Side
// Do not change the layout of these members; the Side() methods below
// depend on this order.
T top, right, bottom, left;
// Constructors
BaseMargin() : top(0), right(0), bottom(0), left(0) {}
BaseMargin(T aTop, T aRight, T aBottom, T aLeft)
: top(aTop), right(aRight), bottom(aBottom), left(aLeft) {}
void SizeTo(T aTop, T aRight, T aBottom, T aLeft) {
top = aTop;
right = aRight;
bottom = aBottom;
left = aLeft;
}
T LeftRight() const { return left + right; }
T TopBottom() const { return top + bottom; }
T& Side(SideT aSide) {
// This is ugly!
return *(&top + int(aSide));
}
T Side(SideT aSide) const {
// This is ugly!
return *(&top + int(aSide));
}
Sub& ApplySkipSides(Sides aSkipSides) {
if (aSkipSides.Top()) {
top = 0;
}
if (aSkipSides.Right()) {
right = 0;
}
if (aSkipSides.Bottom()) {
bottom = 0;
}
if (aSkipSides.Left()) {
left = 0;
}
return *static_cast<Sub*>(this);
}
// Ensures that all our sides are at least as big as the argument.
void EnsureAtLeast(const BaseMargin& aMargin) {
top = std::max(top, aMargin.top);
right = std::max(right, aMargin.right);
bottom = std::max(bottom, aMargin.bottom);
left = std::max(left, aMargin.left);
}
// Ensures that all our sides are at most as big as the argument.
void EnsureAtMost(const BaseMargin& aMargin) {
top = std::min(top, aMargin.top);
right = std::min(right, aMargin.right);
bottom = std::min(bottom, aMargin.bottom);
left = std::min(left, aMargin.left);
}
// Overloaded operators. Note that '=' isn't defined so we'll get the
// compiler generated default assignment operator
bool operator==(const Sub& aMargin) const {
return top == aMargin.top && right == aMargin.right &&
bottom == aMargin.bottom && left == aMargin.left;
}
bool operator!=(const Sub& aMargin) const { return !(*this == aMargin); }
Sub operator+(const Sub& aMargin) const {
return Sub(top + aMargin.top, right + aMargin.right,
bottom + aMargin.bottom, left + aMargin.left);
}
Sub operator-(const Sub& aMargin) const {
return Sub(top - aMargin.top, right - aMargin.right,
bottom - aMargin.bottom, left - aMargin.left);
}
Sub& operator+=(const Sub& aMargin) {
top += aMargin.top;
right += aMargin.right;
bottom += aMargin.bottom;
left += aMargin.left;
return *static_cast<Sub*>(this);
}
friend std::ostream& operator<<(std::ostream& aStream,
const BaseMargin& aMargin) {
return aStream << "(t=" << aMargin.top << ", r=" << aMargin.right
<< ", b=" << aMargin.bottom << ", l=" << aMargin.left << ')';
}
};
} // namespace gfx
} // namespace mozilla
#endif /* MOZILLA_GFX_BASEMARGIN_H_ */